JPH10269964A - Cathode-ray tube device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable correction sensitivity of a convergence yoke to be improved and an easy-assembling structure to be provided by providing a connection portion of a conductive pattern connected to a correction coil of the convergence yoke outside in an outer circumference direction of an annular magnetic body. SOLUTION: A convergence yoke 29 of a color imaging tube device comprises an annular magnetic body 33 in which eight protrusions 32 are provided with equal intervals inside an annular frame 31 toward its center, a total of 24 correction coils 34 mounted to each protrusion 32 by three pieces, and an annular circuit board 35 provided with a conductive pattern to be connected to each correction coil. An outer diameter of the annular circuit board 35 is formed to be slightly greater than that of the annular magnetic body 33, and when these annular magnetic bodies 33 and the annular circuit board 35 are coaxially combined, the periphery of the circuit board 35 is formed in size protruded to the outside in outer circumference direction of the annular magnetic body 33.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a cathode ray tube such as a color picture tube, and more particularly to a cathode ray tube device having a convergence yoke for correcting convergence of a plurality of beams emitted from an electron gun.

[0002]

2. Description of the Related Art Generally, in a color picture tube device, an electron gun for emitting three electron beams is arranged in a neck of a funnel, and the three electron beams emitted from the electron gun are supplied to a deflection yoke mounted outside the funnel. Is deflected by the magnetic field generated by the above, and furthermore, the phosphor screen formed on the inner surface of the panel is horizontally and vertically scanned through a shadow mask, so that a color image is displayed. At present, such color picture tube devices are mainly in-line type color picture tubes which emit three electron beams arranged in a line composed of a center beam and a pair of side beams passing on the same plane. It is widely used in devices and terminal displays of computers.

In such a color picture tube device, it is necessary to improve the convergence of three electron beams on the phosphor screen in order to improve image characteristics displayed on the phosphor screen. In order to correct the convergence of the three electron beams, a purity convergence magnet (PCM) composed of a combination of a plurality of annular permanent magnets is generally mounted outside the neck at the rear of the deflection yoke. There is a color picture tube device provided with a convergence yoke. Especially in recent years, with the development of digital technology,
It becomes feasible to supply an arbitrary correction current at an arbitrary point on the screen, and a convergence yoke for correcting convergence with this correction current is important.

As an example of such a convergence yoke, Japanese Utility Model Application Laid-Open No. Sho 60-32871 discloses that twelve protrusions 2 are provided inside an annular frame 1 as shown in FIGS. A magnetic body 3 and a total of 28 sets of 6 correction coils 4 attached to each of the projections 2 by 2 to 3 pieces;
A circuit board 5 disposed on one surface side of the magnetic body 3 and provided with a conductive pattern connected to each of the correction coils 4
Is shown. Two or three correction coils 4 attached to each projection 1
As shown in FIG. 8C, they are integrally molded.

In this convergence yoke, FIG.
As shown in (a) and (b), six correction coils 4
Of these, two magnetic poles are formed by two sets of correction coils 4, and three electron beams 7B and 7 are arranged in a line and pass on the same plane.
G and 7R are indicated by arrows 8 in three electron beams 7B, 7G and 7R.
Is displaced in the arrangement direction and the direction orthogonal to the arrangement direction to correct the purity. As shown in FIGS. 9C and 9D, four magnetic poles are formed by another two sets of correction coils 4 of the six sets of correction coils 4, and a pair of side beams 7B and 7R are turned by arrows. Displace in eight directions,
The convergence between the pair of side beams 7B and 7R is corrected. Further, as shown in FIGS. 9E and 9F, six magnetic poles are formed by the remaining two sets of correction coils 4, and the center beam 7G and the pair of side beams 7G are formed.
The convergence between the center beam 7G and the side beams 7B, 7R is corrected by displacing B, 7R in the direction of arrow 8.

Japanese Unexamined Patent Application Publication No. Sho 59-186490 discloses a magnetic body 3 provided with eight projections 2 inside an annular frame 1 as shown in FIG. And a circuit board (not shown) provided with a conductive pattern disposed on one surface side of the magnetic body 3 and connected to each of the correction coils 4. A convergence yoke is shown.

This convergence yoke differs from the convergence yoke shown in FIG. 8 in the number of projections, but has the same basic correction function.

[0008]

As described above, the color picture tube improves the convergence of the three electron beams on the phosphor screen in order to improve the image characteristics displayed on the phosphor screen. In order to correct the convergence of the three electron beams, a deflection yoke is provided with a convergence yoke outside the rear neck.

The convergence yoke includes a magnetic body having a plurality of protrusions provided inside an annular frame, a plurality of correction coils attached to each of the protrusions, and one side of the magnetic body. And a circuit board provided with a conductive pattern connected to the correction coil.

However, in the above-mentioned conventional convergence yoke, as shown in FIG. 11, a plurality of openings 10 are provided around a portion of the circuit board 5 where the projections 2 of the magnetic body 3 are arranged. Then, the correction coil 4 is connected to the conductive pattern by soldering to the conductive pattern of the circuit board 5 through the winding end of the correction coil 4. Therefore, there is a problem that it takes time to assemble. In addition, the conventional convergence yoke connects the winding end of the correction coil 4 and the conductive pattern inside the annular frame 1 of the magnetic body 3, so that the inside of the annular frame 1
A space for providing the connection is required. for that reason,
The outer diameter of the annular frame 1 of the magnetic body 3 must be increased,
There is a problem that the correction sensitivity is low.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. In a cathode ray tube apparatus having a convergence yoke for correcting convergence of a plurality of beams emitted from an electron gun, the correction sensitivity of the convergence yoke is improved. An object of the present invention is to improve the structure and make the structure easy to assemble.

[0012]

A convergence yoke for correcting the convergence of a plurality of beams is disposed on the rear neck side of a deflection yoke for deflecting a plurality of beams emitted from an electron gun disposed in the neck. An annular magnetic body provided with a plurality of projections inside the annular frame, a plurality of correction coils attached to each projection of the annular magnetic body, and a plurality of correction coils arranged on one surface side of the magnetic body. In a cathode ray tube device comprising a circuit board provided with a conductive pattern connected to the correction coil, a connection portion of the conductive pattern connected to the correction coil of the convergence yoke is provided on the outer side in the outer peripheral direction of the annular magnetic body.

The connecting portion between the correction coil and the conductive pattern is constituted by a projection projecting from the peripheral portion of the circuit board in the outer peripheral direction, and the winding end of the correction coil is wound around this projection.

A convergence yoke for correcting the convergence of the plurality of beams is arranged on the rear neck side of the deflection yoke for horizontally and vertically deflecting the plurality of beams emitted from the electron gun disposed in the neck. An annular magnetic body having a plurality of projections provided inside an annular frame, a plurality of correction coils attached to each projection of the annular magnetic body, and a plurality of correction coils arranged on one surface side of the magnetic body. In a cathode ray tube device comprising a circuit board provided with a conductive pattern connected to a coil, a correction current or a static current that fluctuates below the cycle of the vertical deflection frequency of the deflection yoke flows through the projection of the annular magnetic body of the convergence yoke. Attach the low frequency convergence correction coil, and make this low frequency convergence correction coil annular It was placed on the side.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a color picture tube device which is one embodiment of the present invention. This color picture tube device has an envelope composed of a panel 20 and a funnel-shaped funnel 22 having a cylindrical neck 21 at one end. On the inner surface of the panel 20,
A phosphor screen 23 made of a three-color phosphor layer that emits blue, green, and red light is provided. On the other hand, an electron gun 26 for emitting three electron beams 25B, 25G, 25R is arranged in the neck 21 of the funnel 22. A deflection yoke 28 for generating horizontal and vertical deflection magnetic fields for deflecting the three electron beams 25B, 25G and 25R emitted from the electron gun 26 is provided outside the vicinity of the boundary between the large diameter portion 27 of the funnel 22 and the neck 21. Is installed. Further, a convergence yoke 29 for correcting the convergence of the three electron beams 25B, 25G, 25R on the phosphor screen 23 is disposed outside the neck at the rear of the deflection yoke 28.

The convergence yoke 29 is shown in FIG.
As shown in (b), an annular magnetic body 33 in which eight projections 32 are provided inside the annular frame 31 toward the center thereof at equal intervals, and each projection 32 of the magnetic body 33 is provided. And a total of 24 correction coils 34 attached to each of the three correction coils 3 arranged on one surface side of the magnetic body 33.
4 is provided with an annular circuit board 35 provided with a conductive pattern. The outer diameter of the annular circuit board 35 is formed to be slightly larger than the outer diameter of the annular magnetic body 33, and when these magnetic bodies 33 and the circuit board 35 are coaxially combined, a peripheral portion of the circuit board 35 is formed. Is formed in such a size as to protrude outside the outer peripheral direction of the magnetic body 33.

Particularly in this embodiment, the magnetic material 3
3 corresponding to each of the protrusions 32 of the magnetic substrate 33, the correction coil 3
4, the connection part 3 of the conductive pattern of the circuit board 35 connected to
6 are provided. As shown in FIG. 2, the connection portion 36 corresponds to the protrusion 32 of the magnetic body 33, and
5 from the bottom of the recess 37 formed in the periphery of the circuit board 3
5 comprises a plurality of projections 38 projecting in the outer peripheral direction. Each of the protrusions 38 has a connection pattern 39 connected to the conductive pattern. The correction coil 34 attached to the protrusion 32 of the magnetic body 33 has its winding end 40 guided to the protrusion 38 via the guide portion 41, wound around the protrusion 38, and connected by soldering. ing.

As described above, the connection portion 36 of the conductive pattern of the circuit board 35 connected to the correction coil 34 attached to the projection 32 of the magnetic body 33 protrudes outside the outer periphery of the magnetic body 33 around the circuit board 35. In this case, unlike the related art, it is not necessary to pass the winding end of the correction coil through the opening provided in the circuit board (see FIG. 11). Then, the convergence yoke can be easily assembled since it may be guided to the connecting portion 36 through the projection and wound around the projection 38 of the connecting portion 36.

A correction coil 34 is provided on a portion inside the annular frame made of a magnetic material like a conventional convergence yoke.
There is no need to provide a space for a connection portion between the ring-shaped magnetic member and the outer diameter of the toroidal magnetic body. as a result,
3A and 3B, the magnetic path 43 is reduced as the outer diameter of the annular magnetic body 33 is reduced, as compared with the case where the magnetic flux flows between the pair of protrusions 32 opposed to each other. Third, the convergence yoke correction sensitivity to three electron beams can be improved. For example, a convergence yoke having an outer diameter of 80 mm
With a convergence yoke of 80 mm, both the actual measurement and the calculation of the magnetic field are 7 times greater than that of the convergence yoke of 80 mm.
It has been found that a convergence yoke of 0 mm improves the correction sensitivity by about 9%.

As described above, it is not necessary to secure a space for connecting the correction coil 34 to the inside of the annular body 31 of the magnetic body 33, and if the outer diameter of the annular magnetic body becomes small, As shown by a solid line and a broken line in FIG.
Corresponding to the reduction in the outer diameter of the magnetic body 33, the cross-sectional area of the projection 32 can be increased, and the number of turns of the correction coil can be reduced. For example, as described above, the correction coil 3
4, the connection part 3 of the conductive pattern of the circuit board 35 connected to
6 is a circuit board 3 protruding outside the outer circumference of the magnetic body 33.
5, the outer diameter of the annular magnetic body 33, which was about 80 mm in the past, can be reduced to about 60 mm, and the cross-sectional area of the protrusion of the magnetic body, which was 5 mm × 5 mm in the past, is 6 mm × 6 mm.
And can be enlarged. Thereby, the number of turns of the correction coil 34 can be reduced by about 70%.

Next, another embodiment will be described.

In the above embodiment, three correction coils are attached along the length direction of the protrusion of the magnetic material.
Is obtained by superposing three correction coils 34 on the projection 32 of the magnetic body 33.

With such a configuration, the correction coil 34 can be effectively attached even if the length of the projection 32 is reduced due to the reduced outer diameter of the magnetic body 33.

FIG. 6 shows a state in which a vertical deflection current or a static current is supplied to the projection 32 of the magnetic body 33 on the side of the annular frame 31 adjacent to the correction coil 34 and at the rear of the normal deflection yoke. A low frequency convergence correction coil 44 such as a VCR correction coil is attached.

When the low-frequency convergence correction coil 44 is disposed adjacent to the correction coil 34 of the convergence yoke 29 in this manner, when the correction coil 34 is mounted close to the annular frame 31, it is indicated by a broken line 45. Magnetic flux not contributing to the convergence correction is generated, and the correction coil 3
Although the inductance of the convergence correction coil 42 operating at a low frequency equal to or lower than the vertical deflection hardly increases, the inductance of the correction coil 34 can be prevented from increasing, and the correction sensitivity can be improved. it can.

[0027]

A convergence yoke for correcting the convergence of a plurality of beams is arranged on the rear neck side of a deflection yoke for deflecting a plurality of beams emitted from an electron gun disposed in the neck. An annular magnetic body provided with a plurality of projections on the inside, a plurality of correction coils attached to each projection of the annular magnetic body, and connected to each correction coil disposed on one surface side of the magnetic body In a cathode ray tube device comprising a circuit board provided with a conductive pattern to be provided, a connection portion of a conductive pattern connected to a correction coil of a convergence yoke is provided on an outer circumferential side of the annular magnetic body, and the correction coil and the conductive The connection portion with the pattern is constituted by a projection protruding in the outer peripheral direction from the peripheral portion of the circuit board, and the winding end of the correction coil is wound around this projection, and A low-frequency convergence correction coil through which a correction current or a static current that fluctuates below the period of the vertical deflection frequency of the deflection yoke flows is attached to the projection of the annular magnetic body of the convergence yoke, and the low-frequency convergence correction coil is more than the correction coil. By arranging it on the annular frame side of the annular magnetic body, the convergence yoke can be easily assembled because it is not necessary to pass the winding end of the correction coil through the opening provided in the circuit board as in the related art. Further, the outer diameter of the annular magnetic body can be reduced, and the correction sensitivity can be improved. In addition, it is possible to increase the cross-sectional area of the protrusion of the magnetic material in accordance with the reduction of the outer diameter of the magnetic material, thereby reducing the number of turns of the correction coil and easily assembling a convergence yoke having excellent characteristics. be able to.

[Brief description of the drawings]

FIG. 1A is a diagram showing a configuration of a color picture tube device according to an embodiment of the present invention, and FIG. 1B is a diagram showing a configuration of a convergence yoke thereof.

FIG. 2A is an enlarged view showing a part of the convergence yoke, and FIG. 2B is a view showing a connection portion between the correction coil and a conductive pattern provided on a circuit board. .

FIGS. 3A and 3B are diagrams for explaining the correction sensitivity of the convergence yoke. FIG.

FIG. 4 is a view for explaining an effect when the outer diameter of the magnetic body of the convergence yoke is reduced.

FIG. 5 is a diagram showing a main part configuration of a convergence yoke different from the convergence yoke shown in FIG. 1 (b).

FIG. 6 is a diagram showing a configuration of a main part of a convergence yoke which is further different from the convergence yoke shown in FIG. 1 (b).

FIG. 7 is a diagram showing a configuration of a conventional convergence yoke.

8 (a) to 8 (c) are views showing components of the conventional convergence yoke.

FIGS. 9 (a) to 9 (f) are diagrams for explaining the correction operation of the conventional convergence yoke.

FIG. 10 is a diagram showing a configuration of a conventional convergence yoke different from the convergence yoke shown in FIG.

FIG. 11 is a diagram for explaining a connection structure between a correction coil and a conductive pattern provided on a circuit board in the conventional convergence yoke.

[Explanation of symbols]

 21 ... Neck 25B, 25G, 25R ... 3 Electron Beam 26 ... Electron Gun 28 ... Deflection Yoke 29 ... Convergence Yoke 31 ... Circular Ring 32 ... Protrusion 33 ... Circular Magnetic Body 35 ... Circuit Board 36 ... Connection 38 ... Protrusion 44 ... Low frequency convergence correction coil

Claims (3)

[Claims] A convergence yoke for correcting the convergence of the plurality of beams is arranged on a rear neck side of a deflection yoke for deflecting a plurality of beams emitted from an electron gun disposed in the neck, and the convergence yoke is formed in an annular frame. An annular magnetic body having a plurality of projections provided inside the annular magnetic body, a plurality of correction coils attached to the respective projections of the annular magnetic body, and the respective correction coils arranged on one surface side of the magnetic body In a cathode ray tube device comprising a circuit board provided with a conductive pattern connected to a coil, in the convergence yoke, a connection portion between the correction coil and the conductive pattern is provided on an outer circumferential side of the annular magnetic body. A cathode ray tube device characterized by the above-mentioned. 2. A connection portion between the correction coil and the conductive pattern comprises a projection projecting from a peripheral portion of the circuit board in an outer peripheral direction, and a winding end of the correction coil is wound around the projection. The cathode ray tube device according to claim 1. 3. A convergence yoke for correcting the convergence of the plurality of beams is disposed on a rear neck side of a deflection yoke for horizontally and vertically deflecting a plurality of beams emitted from an electron gun disposed in the neck. Are disposed on the one side of the magnetic body, an annular magnetic body provided with a plurality of projections inside the annular frame, a plurality of correction coils attached to each projection of the annular magnetic body, In a cathode ray tube device comprising a circuit board provided with a conductive pattern connected to each of the correction coils, the convergence yoke is formed on the protrusion of the annular magnetic body by a correction that fluctuates below a period of a vertical deflection frequency of the deflection yoke. A low-frequency convergence correction coil through which current or static current flows is attached, and the low-frequency convergence correction coil is Cathode ray tube apparatus characterized by being arranged in an annular frame side of the annular magnetic body than.